AnswerID: 359368 Submitted: Monday, Apr 13, 2009 at 13:00
That Troopy Bloke (SA)
Firstly, PCD stands for pitch circle diameter, which is an imaginary circle drawn through all 5 studs.
To work out your PCD, divide your 71mm by 0.58778 = 120.79mm.
This would suggest that your rims are Holden HQ to WB.
The trap here is that Commodore rims are similar....but not close enough to be interchangeable.
If you have access to vernier calipers, you can accurately measure across 2 of the studs and subtract the diameter of one stud, this will give you the correct spacing. For HQ to WB it should be 70.91 (120.65mm or 4.75" PCD), for Commodore it should be 70.53 (120mm or 4.724" PCD)
Hope this helps.
Reply 3 of 3
FollowupID: 627372 Submitted:
Monday, Apr 13, 2009 at 14:05
Member - Charlie M (SA) posted:
More info on wheels
Commodore has 43mm Positive offset (Early 14 & 15inch wheels)
HQ has 13mm Positive offset
which needs to be taken in account or wheels may hit on springs
FollowUp 1 of 1